This is also the way in which persons who are unequal can be most truly friends; for thus they will make themselves equal: but equality and similarity tend to friendship, and most of all the similarity of those who resemble each other in virtue; for such men, being little liable to change, continue as they were in themselves and to one another, and do not ask anything unworthy of one another, or do anything unworthy for one another⁠—nay, rather restrain one another from anything of the sort; for it is characteristic of a good man neither to go wrong himself, nor to let his friend go wrong.

Bad men on the other hand [as friends] have no stability: for they do not even continue like themselves; but for a short space they become friends, rejoicing in each other’s wickedness.

Those, however, who are useful and agreeable to one another continue friends longer, i.e. so long as they continue to furnish pleasure or profit.